Improving the convergence rate of jansson's deconvolution method

Crilly, P.B.; Bernardi, A.; Jansson, Peter; Silva, L.E.B. da

doi:10.1109/tim.2002.807981

Cited by 12 publications

(5 citation statements)

References 2 publications

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“…In the case of iSONG the deconvolution is done by using the procedure described by Crilly et al (2002). To model the intrinsic stellar spectrum a very high S/N spectrum of the target star, not taken through the iodine cell, is needed.…”

Section: Intrinsic Stellar Spectrummentioning

confidence: 99%

Searching for solar-like oscillations in the δ Scuti star ρ Puppis★

Antoci

Handler

Grundahl

et al. 2013

Monthly Notices of the Royal Astronomical Society

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Despite the shallow convective envelopes of δ Scuti pulsators, solar-like oscillations are theoretically predicted to be excited in those stars as well. To search for such stochastic oscillations we organised a spectroscopic multi-site campaign for the bright, metal-rich δ Sct star ρ Puppis. We obtained a total of 2763 high-resolution spectra using four telescopes. We discuss the reduction and analysis with the iodine cell technique, developed for searching for low-amplitude radial velocity variations, in the presence of high-amplitude variability. Furthermore, we have determined the angular diameter of ρ Puppis to be 1.68 ± 0.03 mas, translating into a radius of 3.52 ± 0.07 R ⊙ . Using this value, the frequency of maximum power of possible solar-like oscillations, is expected at ∼ 43 ± 2 cd −1 (498 ± 23 µHz). The dominant δ Scuti-type pulsation mode of ρ Puppis is known to be the radial fundamental mode which allows us to determine the mean density of the star, and therefore an expected large frequency separation of 2.73 cd −1 (31.6 µHz). We conclude that 1) the radial velocity amplitudes of the δ Scuti pulsations are different for different spectral lines; 2) we can exclude solar-like oscillations to be present in ρ Puppis with an amplitude per radial mode larger than 0.5 ms −1 .

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Section: Intrinsic Stellar Spectrummentioning

confidence: 99%

Searching for solar-like oscillations in the δ Scuti star ρ Puppis★

Antoci

Handler

Grundahl

et al. 2013

Monthly Notices of the Royal Astronomical Society

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“…Auto-and cross-correlation prefiltering helps convergence and noise reduction [14,17]. The expression of (10) is always positive and ensures convergence of this iterative method while also increasing the rate of convergence [17]. Furthermore random noise in the measured pattern is significantly reduced as demonstrated in Fig.…”

Section: Jansson Deconvolutionmentioning

confidence: 92%

“…Reducing this noise content without losing too much of the overall information in the signal prior to deconvolution will therefore be advantageous for the performance of the deconvolution process and the quality of the recovered patterns. Auto/crosscorrelation was found to be a very useful prefiltering technique in this context [17]. To apply prefiltering both sides of (4) are convolved with the same expression g RX (-ș), the antenna radiation pattern reversed in direction around rotation angle ș=0, which yields:…”

Section: Jansson Deconvolutionmentioning

confidence: 99%

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Using a combined deconvolution approach to improve measurement and modelling based on the RET theory

Cui

Zhou²,

Chen

2012

2012 7th International Conference on Computer Science &Amp; Education (ICCSE)

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Vegetal barriers presented in the path of radio wave propagation has an key effect on designing wireless communication links. In recent years the theory of Radiative Energy Transfer (RET) has been adopted as a reliable tool to prediction propagation of radio wave through vegetation. The developed RET model requires 4 independent input parameters, which so far had to be extracted from measurements. However, one major factor compromising accuracy of the parameters is distortion caused by the receiving antenna. The measured outcome is a convolution product of the signal pattern and the radiation pattern of the receiver, and therefore needs to undergo an inverse process, i.e. deconvolution, before any parameter can be derived from it. This study proposed a combined method using a prefiltering and the Jansson deconvolution to improve performance of the RET theory. This approach is demonstrated on the signals measured in vegetation setup in an anechoic chamber.

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“…In order to construct the templatefor the observed star we used the Janssond econvolution algorithm (Jansson1 984),a lsou sedb yB utler et al Insteado ft he original Janssona lgorithm we used the updated version of Crilly et al (2002) whichh as af aster convergence.…”

Section: Iodine Data-reduction Softwarementioning

confidence: 99%

Session 4: Future asteroseismic projects

Christensen‐Dalsgaard¹

2009

cia

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Kepler is aN ASAm ission,s cheduled forl aunch in April2 009, whosep rincipalp urpose is to investigatee xtra-solar planetary systems, through the detection of planetary transits across their parent star.A ni mportant goali st od etermine the prevalence of Earth-size planets in Earth-likeo rbits. Ther equiredp hotometric precision alsom akes the missionv eryw ellsuited fora steroseismology,w itht he importantp urpose of characterizingt he central starsi n planetary systems. An extensivea steroseismicp rogrammei sp lanned forK epler,o rganized in an international collaborationi nt he Kepler AsteroseismicS cience Consortium.

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Improving the convergence rate of jansson's deconvolution method

Cited by 12 publications

References 2 publications

Searching for solar-like oscillations in the δ Scuti star ρ Puppis★

Searching for solar-like oscillations in the δ Scuti star ρ Puppis★

Using a combined deconvolution approach to improve measurement and modelling based on the RET theory

Session 4: Future asteroseismic projects

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